Vacuum-chuck



J. H. BURKE AND 0. A. WILMING.

VACUUM CHUCK.

APPLICATION FILED MAR.9. 1920.

Patented May 10, 1921.

FIGURE 1 FIGURE INV aiNTORs UNITED STATES PATENT OFFICE.

JOHN H. BURKE AND OTTO A. WILMIN G, OF SAN JOSE, CALIFORNIA.

VACUUM-CHUCK.

Specification of Letters Patent. Pate t d M o 1921 Application filed March 9, 1920. Serial N 0. 364,590.

To all whom it may concern:

Be it known that we, JOHN H. BURKE and Or'ro A. WILMING, citizens of the United States, and residents of San Jose, in the county of Santa Clara and State of California, have invented certain new and useful Improvements in Vacuum-Chucks, of which the following is a specification.

Our invention relates to improvements in vacuum chucks for use in grinding valves.

In operating a chuck of this kind the vacuum cup is first oiled and then pressed against the valve with sufiicient force to expel all of the air therefrom, the resulting vacuum causing the cup to effectively grip the valve and enable the operator to rotate the same in its seat. Since these valves, however, are usually somewhat difficult to reach and difficult to manipulate it is desirable that the chuck be made with considerable flexibility in order to secure an even grinding to the valve and to prevent premature breaking of the chuck.

It is, then, the object of our invention to provide a chuck of the nature indicated that will be efficient and positive in its operation, as well as durable and flexible to the extent indicated.

In the drawing:

Figure 1 is a side proved chuck.

Fig. 2 is a sectional view on line 22 of Fi 1.

fieferring now more particularly to the drawing, 1 indicates a vacuum cup of vulelevation of our im- -eanized rubber having a substantially flat upper surface 2 through which projects the neck 3 of reinforcing element 4, the said neck 3 being provided with a hole 5. Element 4 is provided with a lower flange 6 cast in the rubber walls of the cup 1 as shown. At 7 is shown reinforcing material such as canvas, doubled over so as to envelop flange 6 of element 4 as shown. At 8 is a handle having a staple 9 fitted into one end thereof and passing through hole 5 in neck 3 of element4 and freely movable therein. This end of handle 8 is reinforced by a ferrule 10.

WVhen the device is used it is secured to a valve as indicated at 12 as hereinbefore set forth. The valve being placed in position for grinding, the handle 8 is twirled between the two hands of the operator thereby quickly grinding the valve into position. With the handle 8 fixed in axial alinement with cup 1 it is necessary to hold the device exactlytrue at all times otherwise an uneven gr nding will result, and frequently the handle 1S broken ofl at the point of its attachment to the cup. By placing a joint at thls point as described we have found that a valve may be ground quickly and smoothly and truly since the handle may take an angular position as indicated at 11 and yet the valve will remain in its proper position. By placing 111 the body of the cup 1 a member 4 having a flange 6 the upper portion of handle 8 in a circular Iorm over the smaller end of the cup as shown.

In this construction we have in effect a rigid cup in a flexible one, the flexible one being brought to its highest efficiency by the rigid one. 7 Since it is desirable to reinforce the thinner wall portions of body 1 we embed therein a flexible reinforcing member as 7, this member being secured to member 4 and strengthening the wall of cup 1.

hile this reinforcement 7 adds to the prac- 131C211. value of the device by assisting in re turning the same to its true shape when not n use and in creating suction when in use, its principal function is to thoroughly lock the member 4 in position in the body of cup 1.

I It is understood of course that changes in form, construction and method of operation may be made within the scope of the appended claims.

e claim 1. A chuck for the purpose specified comprising an elastic vacuum cup and a handle connected thereto and angularly adjustable with relation to the axis thereof.

2. A chuck of the character indicated comprising an elastic vacuum cup, a cup of rigid material embedded therein in axial alinement therewith and having a portion extending outwardly through the back thereof, and a handle connected to said outwardly extending portion and angularly adjustable with relation to the axis thereof.

3. A chuck of the character indicated comprising an elastic vacuum cup, a cup of rigid material embedded therein to coact therewith, flexible reinforcing material inelastic vacuum cup to prevent the separation of said cups, and a handle connected A chuck of the COIIIPIlSlIlg an elastic vacuum cup,

character indicated a cup of 5 rigid material embedded therein in axial alinement therewith and having a portion extending outWar dly through the back thereof said outwardly extending portion having an orifice formed therein at right angles to the axis thereof, a handle, and a staple en- 10 gaging said orifice and inserted in the end of said handle.

JOHN H. BURKE. OTTO A; WILMING. 

